5.4. What dynamic memory chips can be used to upgrade a 3b1/7300?
Description
This article is from the 3b1 computers FAQ, by John B. Bunch with numerous contributions by others.
5.4. What dynamic memory chips can be used to upgrade a 3b1/7300?
The following is a cross-reference list of 256 by 1-bit dynamic memory chips that are usable for 3b1/7300 memory upgrades:
AM90C256-xx AMD Advanced Micro Devices
MB81256-xx FUJ Fujitsu
HM50256-xx HIT Hitatchi
HY53C256-xx - Hyundai
P21256-xx - Intel
M5M4256P-xx MIT Mitsubishi
MCM6256-xx MOT Motorola
UPD41256-xx NEC NEC Technologies
MSM41256-xx OKI Okidata
KM41256-xx - Samsung
TMS4256-xx TI Texas Instruments
TMM4256C-xx TOSH Toshiba
The digits in xx are speed designations--common values are: xx=10 for 100ns; xx=12 for 120ns and xx=15 for 150ns.
Since it is now economically advantageous to obtain chips from third parties (private sales, auctions or hamfests), the manufacture's LOGO and identification stamped on the chip may be the only clues one has for a scavenger hunt. If the experimentalist is not familiar with the Manufacture's LOGOs, a perusal of a computer magazine (PC World, etc.) should help one to become familiar with most of them. Good hunting!
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